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Same problem with me, i turn Garmin Dakota10 on and them after the Garmin show up he goes off... i made what JS424 said and worked 100%! JS424 said "I found out what the problem is with the GPS. I had the same problem and searched for solutions. Your dakota needs an update. Very easy, took me 10 min. Goto Garmin,com and download webupdate. Plug in your dakota and power on. click on check for updates in webupdate. It will search and find your GPS. Follow all the promps and leave plugged in until completely done. After update installed and you power unit you will see the GPS downloading the update. After that your good 2 go. I just powered my dakota up 12 times and comes right on. Good Luck!!!" Maybe solve your problem too

had same problem. the cause was corrosion in the boat wiring. the power wire was corroded 95%thru. there was enough voltage to start the unit but when the sounder kicks in the voltage dropped below minimum and the unit shut off. took a LOOOONG time to find.